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Animal manure is a source of undesired gaseous emissions as there are ammonia, nitrous oxide, methane and odor. Husbandry systems with solid manure are in minority in Germany but may become advanced because of animal welfare requirements. Investigations so far were focused on liquid manure. There is a lack of knowledge and mitigation strategies concerning solid manure systems.

The effects of the bulk density of solid dairy manure on the mentioned gaseous emissions during manure storage were investigated on laboratory scale. The manure was stored in open vessels with 60 kg, respectively. Manure bulk densities between 700 and 1000 kg/m³ were adjusted by mechanical compacting at the beginning of the storage period which was up to 95 days.

Results showed no significant influence of bulk density on ammonia emission. A higher bulk density had the tendency to diminish nitrous oxide and even more methane emission. The measured nitrous oxide emission was higher compared to liquid manure. The determined odor thresholds were very low, an influence of the bulk density of the manure could not be proved.